Welp, finished plans on my first sonosub and got my amp for it. Tell me what you think. (used adire's software) Driver: Tempest 15" Amp: Carver m500t (700 Watts mono 4 ohm) Sonotube: 250 liters (24" wide, 36" height) 1 flared vent - 17" long x 4" wide (on bottom cap) 50% fill Tuned to 13.0 Hz I'm going to be using the 3/4" MDF for the top and bottom caps, and was planning on putting a floor plate 2" under the bottom cap (is there a specific distance you should keep this plate from the bottom cap?) I used to following website to do all unit conversions and for LspCAD help. http://www.quux.net/roo/diy/sonosub/ Lemme know what you think and if you have and suggestions. This is my first attempt and I'm ready to be "critiqued" (go ahead and tear me apart...what the hell) Thanx Mike BTW - Can anyone explain the whole piano black shine thing to me.